Improvement in hydraulic safety-valves



UNITED STATES PATENT OEEToEo JOHN F. TAYLOR, OF CHARLESTON, SOUTHCAROLINA.

IMPROVEMENT IN HYDRAULIC SAFETY-VALVES.

Specication forming part of Letters Patent No. 158,333, dated December29, 1874; application tiled November 16, 1874.

To all whom it may concern:

Be it known that I, JOHN F. TAYLOR, of the city and county ofCharleston, and State of South Carolina, have invented a new andImproved Hydraulic Safety-Valve; and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawing forming a part of thisspecification, in whichi Figure l is a vertical section. Fig. 2 is atransverse sect-ion through line a' av. Fig. 3 is a transverse sectionthrough line y y.

This invention relates to certain improvements in safety-valves, mainlyintended for hydraulic presses, but applicable also to steam and airengines. The invention consists in novel means whereby the valve may beweighted with great convenience and facility by the aid of the iiuidemployed, as hereinafter fully described, and pointed out in the claims.

In the drawing, A represents the valvechamber, in which I locate myvalve B, provided with a stem, C, that passes through the cap D, and istightly packed within the same. Valve B rests upon its seat E above thewater-chamber G, and closes the annular outlets F. H areequalizing-passages through Athe valve, which connect the water-chamberG with another chamber, G', above the valve, so that the diii'erence ofarea upon the upper and lower side of the valve is the unit of pressure.For instance, if it is desired to admit a pressure of two thousand sixAhundred pounds to the square inch before allowing the valve to act andthe huid to escape through the outlet, we will suppose the lower area ofthe piston is twelve inches and the upper area is eleven inches, and thevalve weighted to two thousand six hundred pounds; then the unit ofpressure will be all the weight einployed by ine-z'. e., two thousandsix hundred pounds to the square inch-whereas, with the pressure uponone side of the piston alone, the valve would have to be weighted tothirty-one thousand two hundred pounds, or twelve times two thousand sixhundred, to give the same unit of pressure, the area being the same 5or, instead of this, I should be compelled to use an inch pipe with thetwo thousand six hundred pound weight, which pipe would not relieve thepressure fast y enough.

The above-described arrangement I prefer to all others, as I can make myvalve of any reasonable size, and make the weight anything I choose, thevalve being so constructed as to relieve a large body ot' waterinstantly and with a comparatively small weight.

Having thus described my invention, what I claim as new is l. Avalve-chamber provided with openings in its seat connecting with theescapepipe, in combination with a valve having different areas ofpressure' upon its opposite sides, substantially as and for the purposedescribed.

2. A valve having holes through the same for the purpose of admittingpressure to the upper side of the valve and letting the pressure offwhen the valve rises, substantially as and for the purpose described.

3. The combination, with a water-chamber having an annular outlet, of aweighted valve having', on opposite sides, different areas of pressure,and equalizing-passages H through the same, substantially as and for thepurpose described.

JOHN F. TAYLOR.

Witnesses:

J oHN D. KELLY, A. 1t. WALKER.

